It sounds dumb but after two weeks of being together, I really knew that I would marry my husband. We resisted saying "I love you" for months, though, because we didn't want to take it lightly. What ended up happening was I was helping him clean his kitchen once and we passed each other in the hallway and he kissed my forehead and said "I love ya. Aww sh** I just said that!!" Haha. Nothing to be scared of. But if you're feeling rushed, tell him. It's nothing to be ashamed of. Everything needs to be comfortable for both of you.